Magnetic recording medium and manufacturing method therefor
US6203892A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1999 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Feb 4, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
It is an object to provide a magnetic recording medium which is capable of satisfactorily preventing deformation thereof and maintaining an excellent state of contact with a magnetic head, which exhibits satisfactory durability and an excellent recording/reproducing characteristic and which is able to realize a high linear recording density. A magnetic recording medium incorporates a non-magnetic support member in the form of a biaxially-oriented polyethylene terephthalate film and magnetic layers formed on the non-magnetic support member and containing ferromagnetic powder and a polymer material. The non-magnetic support member is structured such that difference .DELTA.n.sub.1 between a refractive index of a first main surface and that of a second main surface is 1.times.10.sup.-3 or smaller. It is preferable that the thickness of the non-magnetic support member is 30 .mu.m or greater, a coefficient of thermal contraction at 80.degree. C. is 0.1% or lower and the difference .DELTA.n.sub.2 between a maximum value and a minimum value of the refractive index in each main surface is 15.times.10.sup.-3 or smaller. It is preferable that magnetic layers contain thermosetting polyisocyana…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.